IOS 8.4 plays music on its own

Sonce I've installed IOS 8.4 for my iPhone 6 my Apple Music has been playing music randomly by itself. This happened very recently while I was on Twitter I tapped a video and it played halfway then froze and apple music started playing music from my library on its own without me accessing it and Siri always activates when this happens without me touching the home button. Not sure it this is a bug or someone's doings. It's never occurred before I installed IOS 8.4 Thursday. Nothing else seems affected by the update otherwise.